Engine assembly

Abstract

The present invention belongs to the field of engine technology, and specifically relates to an engine assembly. The engine assembly in the present invention includes a cylinder assembly and a water pump. The cylinder assembly includes a body, a cylinder liner and a cylinder head. The body is provided with an installation cavity. The cylinder liner is provided inside the installation cavity. A first cooling channel is formed between the outer wall of the cylinder liner and the cavity wall of the installation cavity. The first cooling channel is connected to a water outlet passage. The water outlet passage has a water diversion port and a water outlet. The water diversion port is connected to the water pump. A second cooling channel is provided inside the cylinder head. The water outlet is connected to the second cooling channel. The second cooling channel is connected to the water pump. By using the engine assembly in this technical solution, the cooling effect of the cylinder liner is improved, and the problems of deformation, wear and abnormal vibration of the cylinder liner due to poor cooling effect are effectively alleviated, which is beneficial to improving the overall performance of the engine assembly and extending the service life of the engine assembly.

Description

Technical Field

[0001] The present invention belongs to the technical field of engines, and in particular relates to an engine assembly. Background Art

[0002] During engine operation, the temperatures of the gases within the cylinders often reach hundreds of degrees Celsius. If this heat cannot be dissipated promptly, engine components will overheat and become damaged. Components in direct contact with the hot gases, in particular, will expand due to the high temperatures, causing changes in clearances. These changes can adversely affect engine operation and may even lead to performance degradation or failure. To address this issue, the engine's liquid cooling system plays a crucial role in its structural design. The liquid cooling system uses a water pump to increase the pressure of the cooling water, forcing it to circulate throughout the engine. This circulating cooling water effectively removes the heat generated during engine operation, helping the engine maintain an appropriate operating temperature range. In this way, the liquid cooling system ensures that the temperature of engine components remains at a safe level, preventing thermal expansion and other related problems caused by overheating, thereby ensuring stable engine operation and extending its service life.

[0003] During engine operation, the connecting rod drives the piston and its piston rings in reciprocating motion. During this process, the outer surface of the piston ring continuously rubs against the inner surface of the cylinder liner, generating continuous heat. Simultaneously, hot gases generated during the exhaust stroke are discharged through the exhaust duct within the cylinder head, while the fuel injectors installed inside the cylinder head are constantly operating. Therefore, to ensure proper engine operation, both the cylinder liner and the cylinder head require external cooling. In traditional engine designs, cooling water, after exchanging heat with the cylinder liner, flows into the cylinder head, then passes through the thermostat and radiator before returning to the water pump. However, due to the large pressure drop across the entire system, the amount of cooling water at the top of the cylinder liner is relatively low, resulting in suboptimal cooling. This situation can easily lead to overheating and deformation of the cylinder liner top. Deformation of the cylinder liner top can cause a series of problems, including severe cylinder liner wear, cavitation on the cylinder liner surface caused by abnormal vibration, and aging of the seal ring.

[0004] In existing engine configurations, increasing the cooling water flow around the cylinder liner can usually only be achieved by increasing the head or power of the water pump. However, this approach often has limited effectiveness.

[0005] Therefore, in order to improve the cooling effect of the engine, it is necessary to improve the existing cooling system to ensure that the cylinder liner and cylinder head can be fully and evenly cooled, thereby avoiding various problems caused by overheating. The present invention provides an engine assembly with improved cooling effect to solve the above problems. Summary of the Invention

[0006] The object of the present invention is to at least solve the problem of poor cooling effect of the cylinder assembly. This object is achieved by the following technical solutions:

[0007] A first aspect of the present invention provides an engine assembly, comprising:

[0008] A cylinder assembly and a water pump, the cylinder assembly includes a body, a cylinder liner and a cylinder head, an installation cavity is provided inside the body, the cylinder liner is provided inside the installation cavity, a first cooling channel is formed between the outer wall of the cylinder liner and the cavity wall of the installation cavity, the first cooling channel is connected to a water outlet passage, the water outlet passage has a water diversion port and a water outlet, the water diversion port is connected to the water pump, a second cooling channel is provided inside the cylinder head, the water outlet is connected to the second cooling channel, and the second cooling channel is connected to the water pump.

[0009] By providing a first cooling channel on the outer wall of the cylinder liner, the cylinder liner comes into direct contact with the cooling water, effectively exchanging heat. The heat-exchanged cooling water then flows through the outlet passage to the water diversion port and the water outlet. The cooling water flowing out of the water diversion port returns to the water pump, while the cooling water flowing out of the water outlet enters the second cooling channel inside the cylinder head. Inside the cylinder head, the cooling water continues to exchange heat with the cylinder head, absorbing heat from the cylinder head. It then flows out of the second cooling channel and returns to the water pump, completing the cooling cycle. This structural arrangement not only ensures sufficient heat exchange between the cylinder liner and the cooling water, but also effectively cools the cylinder head. This effectively controls the temperatures of both the cylinder liner and the cylinder head, preventing deformation, wear, and abnormal vibration caused by excessive temperatures. Furthermore, the addition of the water diversion port significantly increases the cooling water flow rate compared to existing cylinder assemblies, further enhancing the cooling efficiency of the cylinder liner and effectively alleviating deformation, wear, and abnormal vibration caused by poor cooling. Through this improvement, not only the overall performance of the engine assembly is improved, but also the service life of the engine assembly is effectively extended, ensuring the stable operation of the engine assembly under various working conditions.

[0010] In addition, the engine assembly of the present invention may also have the following additional technical features:

[0011] In some embodiments of the present invention, the engine assembly further includes an engine accessory, the water diversion port is in communication with the engine accessory, and the engine accessory is in communication with the water pump.

[0012] In some embodiments of the present invention, a reinforcement portion is provided on the outer side of the water outlet passage.

[0013] In some embodiments of the present invention, a first supporting shoulder is provided at the top of the cylinder liner, and a second supporting shoulder is provided at the top of the water outlet passage, the first supporting shoulder and the second supporting shoulder abut against each other, and a height H from the second supporting shoulder to the bottom of the reinforcement portion is greater than the sum of a height X from the second supporting shoulder to the top of the water outlet passage and a height Y of the water outlet passage.

[0014] In some embodiments of the present invention, a plurality of cylinder liners are provided in the machine body, and the outer wall of each cylinder liners forms the first cooling channel with the cavity wall of the installation cavity, and each first cooling channel is connected to a water outlet passage, and a plurality of the water outlet passages have the water outlet, and at least one water outlet passage has the water diversion port.

[0015] In some embodiments of the present invention, adjacent first cooling channels are connected via a connecting channel.

[0016] In some embodiments of the present invention, the connecting channel is located between two adjacent cylinder sleeves, the flow direction of cooling water in the connecting channel is inclined toward the water outlet channel, and the angle between the axial direction of the connecting channel and the front end surface of the cylinder assembly is a first angle a1:

[0017] 30°≤a1<90°.

[0018] In some embodiments of the present invention, a water inlet main pipe is provided inside the body, a water inlet passage is provided between the water inlet main pipe and the first cooling channel, and the first cooling channel is connected to the water inlet main pipe through the water inlet passage.

[0019] In some embodiments of the present invention, the axial direction of the water outlet passage and the axial direction of the water inlet passage are located on the same maximum outer diameter of the cylinder liner;

[0020] The angle between the axial direction of the water outlet passage and the front end surface of the cylinder assembly is a second angle a2, and the angle between the axial direction of the water inlet passage and the front end surface of the cylinder assembly is a third angle a3:

[0021] a2=a3, and 25°≤a2≤75°.

[0022] In some embodiments of the present invention, the cylinder assembly includes a water outlet manifold, the second cooling channel is connected to the water outlet manifold, and the water outlet manifold is used to communicate with a thermostat. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present invention. The same reference numerals are used throughout the accompanying drawings to denote the same components. In the accompanying drawings:

[0024] Figure 1 Schematically shows a partial cross-sectional view of an engine assembly according to an embodiment of the present invention;

[0025] Figure 2 Schematically shows Figure 1 A partial enlarged view of point A in the middle;

[0026] Figure 3 Schematically shows a schematic diagram of the flow direction of cooling water in an engine assembly according to an embodiment of the present invention;

[0027] Figure 4 Schematically shows the convection heat transfer coefficient of each cylinder according to the embodiment of the prior art;

[0028] Figure 5 Schematically shows the convection heat transfer coefficient of each cylinder according to an embodiment of the present invention;

[0029] Figure 6 Schematically shows a partial structural diagram of an engine assembly according to an embodiment of the present invention;

[0030] Figure 7 Schematically shows an embodiment of the present invention Figure 6 Schematic diagram of the cross section of AA;

[0031] Figure 8 Schematically shows an embodiment of the present invention Figure 6 Schematic diagram of the cross section of the BB.

[0032] The reference numerals in the accompanying drawings represent the following:

[0033] 100. Engine body; 110. Water inlet manifold; 120. Reinforcement portion; 121. Second supporting shoulder; 200. Cylinder liner; 210. First cooling channel; 220. Water outlet passage; 221. Water diversion port; 222. Water outlet; 230. Connecting channel; 240. Water inlet passage; 250. First supporting shoulder; 300. Cylinder head; 310. Second cooling channel; 320. Water outlet manifold; 10. Front end; 20. Rear end. DETAILED DESCRIPTION

[0034] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0035] It should be understood that the terms used herein are for the purpose of describing specific example embodiments only and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "comprise", "include", "contain" and "have" are inclusive and therefore specify the presence of stated features, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring them to be performed in the specific order described or illustrated, unless the order of execution is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0036] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates otherwise, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0037] For ease of description, spatially relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figures, such as "inside," "outside," "inside," "outside," "below," "beneath," "above," and the like. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is flipped over, an element described as "below" or "beneath" another element or feature would then be oriented "above" or "above" the other element or feature. Thus, the example term "below" can encompass both above and below orientations.

[0038] Figure 1 A partial cross-sectional view of an engine assembly according to an embodiment of the present invention is schematically shown. Figure 2 Schematically shows Figure 1 A partial enlarged view of the middle A. Figure 1 and Figure 2 As shown, the present invention proposes an engine assembly, which includes a cylinder assembly and a water pump. The cylinder assembly includes a body 100, a cylinder liner 200 and a cylinder head 300. The body 100 is provided with an installation cavity inside, and the cylinder liner 200 is provided inside the installation cavity. A first cooling channel 210 is formed between the outer wall of the cylinder liner 200 and the cavity wall of the installation cavity. The first cooling channel 210 is connected to a water outlet passage 220. The water outlet passage 220 has a water diversion port 221 and a water outlet 222. The water diversion port 221 is connected to the water pump. A second cooling channel 310 is provided inside the cylinder head 300. The water outlet 222 is connected to the second cooling channel 310, and the second cooling channel 310 is connected to the water pump.

[0039] By providing a first cooling channel 210 on the outer wall of the cylinder liner 200, the cylinder liner 200 is in direct contact with the cooling water, effectively exchanging heat. The cooling water then flows through the water outlet passage 220 to the water diversion port 221 and the water outlet 222, respectively. The cooling water flowing out of the water diversion port 221 flows back into the water pump, while the cooling water flowing out of the water outlet 222 enters the second cooling channel 310 inside the cylinder head 300. Inside the cylinder head 300, the cooling water continues to exchange heat with the cylinder head 300, absorbing heat from the cylinder head 300. It then flows out of the second cooling channel 310 and ultimately returns to the water pump, completing the cooling cycle. This structural arrangement not only ensures sufficient heat exchange between the cylinder liner 200 and the cooling water, but also effectively cools the cylinder head 300. This effectively controls the temperatures of both the cylinder liner 200 and the cylinder head 300, preventing problems such as deformation, wear, and abnormal vibration caused by excessive temperatures. Furthermore, the addition of water diversion port 221 significantly increases the cooling water flow compared to existing cylinder assemblies, further enhancing the cooling effect of cylinder liner 200 and effectively alleviating problems such as deformation, wear, and abnormal vibration of cylinder liner 200 caused by poor cooling. This improvement not only improves the overall performance of the engine assembly but also effectively extends its service life, ensuring stable operation under various operating conditions.

[0040] Furthermore, the water outlet passage 220 is arranged at the top position of the cylinder liner 200. During the work of the piston, the closer the cylinder liner 200 is to the combustion chamber, the higher the heat load it bears. Therefore, cooling the top of the cylinder liner 200 is particularly critical and important. Depending on the specific layout and design of the cooling water flow channel, the cooling capacity obtained by the cylinder liner 200 at different positions will also be different. Setting the water outlet passage 220 at the top position of the cylinder liner 200 can effectively increase the cooling water flow in the top area. In this way, the cooling effect at the top will be significantly improved, thereby better protecting the top of the cylinder liner 200 from damage due to high temperature and ensuring the stable operation of the engine assembly.

[0041] Furthermore, the engine assembly also includes engine accessories, the water diversion port 221 is connected to the engine accessories, and the engine accessories are connected to the water pump.

[0042] The engine accessories take water from the water diversion port 221, and this part of the cooling water returns directly to the water pump after passing through the engine accessories. This design has a significant pressure drop advantage compared to the traditional cooling water circulation flow path. Due to the small pressure drop, the cooling water flow outside the cylinder liner 200 is increased, thereby improving the cooling efficiency. At the same time, since water is taken at the top of the cylinder liner 200, the cooling water flow rate at the top of the cylinder liner 200 can be increased, improving the cooling effect at the top of the cylinder liner 200, and solving the problems of large deformation of the cylinder liner 200, aging of the sealing ring, and high temperature at the piston ring position caused by poor cooling effect at the top of the cylinder liner 200. Therefore, the engine assembly in this embodiment has good working performance and a long service life, and can operate stably under various working conditions. Under this setting method, the water diversion port 221 serves as the water intake position of the engine accessories. By setting the water intake position of the engine accessories at the water diversion port 221, the characteristics of the engine accessories requiring cooling water are fully utilized, and the heat exchange capacity of the cylinder liner 200 is effectively improved.

[0043] For example, engine accessories may include an air compressor cooler. During operation, the compressor pressurizes air and stores it in a tank, generating high pressure and generating a significant amount of heat. If the air compressor is not cooled promptly, it may overheat, posing a risk. Therefore, an air compressor cooler is used to cool the compressor and ensure it can maintain continuous operation. Water cooling is a common cooling method for air compressors. Another example of an engine accessory may include a urea injector. Urea injectors are used to inject urea-water solution and are typically used with selective catalytic reduction technology, primarily to reduce nitrogen oxides (NOx) emissions from diesel vehicles. By injecting urea-water solution into the exhaust gas stream, a catalytic reduction reaction is initiated, reducing environmental pollution from exhaust gases. Engine accessories may also include a turbocharger cooler. Turbochargers are located in the exhaust system of the engine assembly and are directly exposed to high-temperature exhaust gases. Their operating temperatures are very high, at least above 400°C. Due to the high exhaust gas temperatures and the high-speed rotation of the turbine, turbocharger temperatures can easily reach 600°C or even higher. In extreme cases, temperatures can reach 1000°C or higher. Such a high-temperature environment places extremely high demands on the materials and structure of the turbocharger, and also requires effective cooling measures to ensure its normal operation. Water cooling is a commonly used cooling method for existing turbochargers. It is understandable that the engine accessories referred to in this embodiment are not limited to air compressor coolers, urea nozzles, and supercharger coolers. Water diversion port 221 can serve as a water intake for one or more engine accessories, and of course, it can also serve as a water intake for vehicle accessories, and the specific configuration is based on actual needs.

[0044] Further, see Figure 2 A reinforcement portion 120 is provided on the outer side of the water outlet passage 220 .

[0045] By adding a water diversion port 221, the convection heat transfer coefficient between the cylinder liner 200 and the cooling water is significantly improved, thereby effectively improving the cooling performance of the cylinder liner 200. However, due to the addition of the water diversion port 221 on the water outlet passage 220, the opening in the engine body 100 is increased, resulting in a relatively weak structural strength at this location. In order to address this problem, by providing a reinforcement portion 120 at the corresponding position, the loss of local strength of the engine body 100 caused by the opening of the engine body 100 can be compensated to a large extent. In this way, not only the structural strength and rigidity at this location are improved, but it also helps to reduce the vibration amplitude of the cylinder liner 200 at this location, thereby effectively reducing the risk of cavitation of the cylinder liner 200 at this location. Through this design optimization, it can be ensured that the engine assembly maintains good performance and reliability during long-term operation.

[0046] Furthermore, a first supporting shoulder 250 is provided at the top of the cylinder liner 200, and a second supporting shoulder 121 is provided at the top of the water outlet passage 220. The first supporting shoulder 250 and the second supporting shoulder 121 abut against each other, and the height H from the second supporting shoulder 121 to the bottom of the reinforcement portion 120 is greater than the sum of the height X from the second supporting shoulder 121 to the top of the water outlet passage 220 and the height Y of the water outlet passage 220.

[0047] Optionally, the first support shoulder 250 is located at the top of the cylinder liner 200, forming a transition fit with the engine body 100, thereby playing a positioning and sealing role. This arrangement ensures the correct position of the cylinder liner 200 in the engine body 100, preventing it from moving or offsetting, and also helps prevent leakage of engine oil or other liquids. During the operation of the cylinder assembly, the support shoulder is also subjected to a certain amount of pressure and heat, so its material and design must be able to withstand these extreme conditions. For example, in some cases, if the support shoulder breaks, it will cause the cylinder liner 200 to lose its positioning, and then cause the cylinder liner 200 as a whole to jump into the crankcase and be broken by the rotating crankshaft and connecting rod, causing serious damage to the cylinder assembly.

[0048] It is understandable that as the height X from the second support shoulder 121 to the top of the water outlet passage 220 increases, the structural strength increases accordingly. However, during the design process, it is important to consider that the water outlet passage 220 needs to have sufficient flow area to ensure smooth water flow. At the same time, the position of the water outlet passage 220 must also be optimal to ensure good heat dissipation. Therefore, during the design process, it is necessary to comprehensively consider the height of the second support shoulder 121 and the height of the water outlet passage 220 to achieve the best balance. In a preferred design, by calculating the surface pressure and strength of the cylinder liner 200 support shoulder, it can be determined that the contact surface between the first support shoulder 250 and the second support shoulder 121 should be higher than the position of the first piston ring (i.e., the ring closest to the combustion chamber). This design approach can better accommodate wear and tear that may occur between the cylinder liner 200 and the piston ring during long-term use, resulting in changes in the gap. In this way, the sealing effect can be significantly enhanced, ensuring the stability of the structure during operation. In addition, to ensure sufficient structural strength of the support shoulder, the width of the support shoulder should be greater than 2 mm. This design ensures uniform cooling medium flow at the support shoulder, preventing throttling or interruption due to wear of the support shoulder, thereby improving heat exchange capacity at the top of the cylinder liner 200. Regarding the dimensional design of the reinforcement portion 120, the height H from the second support shoulder 121 to the bottom of the reinforcement portion 120 must be greater than the sum of the height X from the second support shoulder 121 to the top of the water outlet passage 220 and the height Y of the water outlet passage 220. This arrangement effectively strengthens weak areas of the engine body 100, thereby improving the stability and reliability of the overall structure.

[0049] When designing the water outlet passage 220, it is possible to consider setting the height Y of the water outlet passage 220 to be greater than 1 / 3 of the piston stroke. Such a design can ensure that the cooling water has sufficient space when passing through the water outlet passage 220, thereby reducing water flow resistance, improving the efficiency of the pump, and enhancing the cooling effect around the piston. In addition, the thickness Z of the top plate at the top of the water outlet passage 220 is also an important design parameter. According to actual application requirements, the top plate thickness Z can be set between 8mm and 15mm to ensure the strength and stability of the structure. For example, the top plate thickness Z can be 8mm, 10mm, 12mm, 14mm or 15mm, etc. In order to further optimize the design of the water outlet passage 220, the size of the diameter φ of the water diversion port 221 needs to be determined through computational fluid dynamics (CFD) simulation. CFD simulation is a numerical simulation method that uses a computer to numerically solve the flow control equation to analyze and predict fluid flow phenomena. Through CFD simulation, the optimal diameter φ of the water diversion port 221 can be accurately calculated to ensure that the cooling water flow rate is effectively improved.

[0050] Furthermore, the cylinder assembly provided in this embodiment can be applied to a single-cylinder engine as well as a multi-cylinder engine. Figure 3 Schematically shows the flow of cooling water in the cylinder assembly according to an embodiment of the present invention, see Figure 3 A plurality of cylinder liners 200 are provided in the engine body 100. The outer wall of each cylinder liners 200 and the cavity wall of the installation cavity form a first cooling channel 210. Each first cooling channel 210 is connected to a water outlet passage 220. The plurality of water outlet passages 220 have a water outlet 222, and at least one water outlet passage 220 has a water diversion port 221.

[0051] In the design and layout of a multi-cylinder engine, taking into account the installation and layout requirements of the engine assembly on the vehicle, the water pump is usually placed at the front end 10 of the cylinder assembly. Specifically, when the cylinder assembly is installed on the vehicle and the driver faces forward, the water pump will be placed at the front end 10 of the cylinder assembly, that is, the fan end. This design is to meet the cooling needs of each cylinder of the cylinder assembly during operation. The cooling water starts from the water pump and passes through the cooling system inside the engine assembly, and is distributed to each cylinder block from front to back in sequence to ensure that each cylinder block can be effectively cooled. Similarly, the return water generated by the engine assembly during operation, that is, the cooling water that has absorbed heat, will also follow the opposite path, starting from the front end 10, and return to the water pump before the rear end 20.

[0052] During the operation of the engine assembly, due to certain differences in the cooling water distribution paths of each cylinder, this difference will lead to different flow resistances on the cooling water distribution paths of each cylinder. Taking a six-cylinder engine as an example, the front end 10 of the cylinder assembly is defined as the first cylinder, and then arranged backward in sequence as the second cylinder, the third cylinder, the fourth cylinder, the fifth cylinder and the sixth cylinder. Through such analysis, we can draw a conclusion: the cooling water delivery path of the first cylinder is the shortest, so its flow resistance is also the smallest, which means that the cooling water flow rate allocated to the first cylinder is the largest. On the contrary, the cooling water delivery path of the sixth cylinder is the longest, so its flow resistance is the largest, the cooling water flow rate allocated to the sixth cylinder is the smallest, and the heat transfer coefficient is also the smallest, which will affect the timely dissipation of heat from the cylinder liner 200.

[0053] Due to differences in heat exchange capacity between cylinders, this will lead to differences in the performance of each cylinder or the service life of related components. For example, during the installation of the cylinder liner 200 onto the engine body 100, a sealing ring is required to seal the cooling water between the engine body 100 and the cylinder liner 200. However, due to the different heat exchange capacity of each cylinder, this will lead to differences in the service life of the sealing rings of each cylinder. In addition, in a multi-cylinder engine, the bolt pressure on the last cylinder cylinder head 300 is generally greater, which causes the support shoulder of the last cylinder liner 200 to bear greater force. If the heat dissipation capacity is poor, it will further aggravate the damage to the support shoulder, thereby affecting the overall performance and service life of the cylinder assembly.

[0054] When the cylinder assembly is provided with multiple cylinders, the water diversion port 221 can be provided on a certain body 100, or the water diversion ports 221 can be provided on multiple bodies 100. For example, see Figure 3 The sixth cylinder is the end position of the entire water channel and is the position with the highest flow resistance. A water outlet 221 can be set on the body 100 of the sixth cylinder. Figure 4 The convective heat transfer coefficient of each cylinder according to the embodiment of the prior art is schematically shown. Figure 5 The convective heat transfer coefficient of each cylinder according to the embodiment of the present invention is schematically shown. Figure 4 and Figure 5It can be clearly seen that after the water diversion port 221 is set on the body 100 of the sixth cylinder, the heat transfer coefficient of the sixth cylinder has been significantly improved. In addition, the heat transfer coefficients of the other cylinders have also been improved to varying degrees. It can be seen that the setting of the water diversion port 221 can not only effectively increase the flow rate of cooling water, but also serve as a regulator for the distribution of cooling water flow in a multi-cylinder engine, thereby improving the cooling efficiency of the entire system. Of course, the setting of the water diversion port 221 is not limited to the sixth cylinder only, it can also be distributed in other cylinders. The specific location selection can be determined based on the results of computational fluid dynamics simulation. By performing detailed simulation calculations, it can be ensured that the dispersion of the cooling water flow of each cylinder is minimized, thereby improving the uniformity of cooling of each cylinder. Such optimization measures can greatly avoid common problems in six-cylinder engines, such as support shoulder wear and thermal aging of the cylinder liner 200 sealing ring.

[0055] Furthermore, Figure 6 The figure schematically shows a partial structural diagram of a cylinder assembly according to an embodiment of the present invention. Figure 7 Schematically shows an embodiment of the present invention Figure 6 Schematic diagram of the cross section at A. Figure 6 and Figure 7 Adjacent first cooling channels 210 are connected through a connecting channel 230 .

[0056] By providing a connecting channel 230 between adjacent first cooling channels 210, the cooling water can flow directly from the outside of one cylinder liner 200 to the outside of the adjacent cylinder liner 200, thereby effectively improving the flow rate and flow velocity of the cooling water. At the same time, the heat exchange uniformity of each cylinder can be uniformed, ensuring the consistency of the sealing ring life of each cylinder, and avoiding cavitation failures caused by sudden changes in the cooling water flow velocity.

[0057] Furthermore, the connecting channel 230 is located between two adjacent cylinder sleeves 200, and the flow direction of the cooling water in the connecting channel 230 is inclined toward the water outlet passage 220. The angle between the axial direction of the connecting channel 230 and the front end face of the cylinder assembly is a first angle a1: 30°≤a1<90°.

[0058] It is understandable that the flow direction of the cooling water in the connecting channel 230 is designed to be inclined toward the direction of the water outlet passage 220. Such a design is intended to form a tangential force that promotes the flow of cooling water, thereby promoting the flow of cooling water toward the direction of the water outlet passage 220. In this way, the flow rate and flow velocity of the cooling water can be effectively improved, thereby enhancing the cooling effect. In practical applications, the first angle a1 can be set to different values ​​such as 30°, 45°, 60° or 75°, depending on actual needs and design parameters. In order to determine the optimal value of the first angle a1, a computational fluid dynamics simulation calculation method can be used. Through CFD simulation, the flow of cooling water in the connecting channel 230 can be analyzed in detail, including the uniformity and piezoresistive distribution of the cooling water. By comprehensively considering the uniformity of the cooling water and the piezoresistive cloud map, a suitable value of the first angle a1 can be selected.

[0059] Furthermore, Figure 8 Schematically shows an embodiment of the present invention Figure 6 Schematic diagram of the cross section at B. Figure 6 and Figure 8 A water inlet main pipe 110 is provided inside the body 100, and a water inlet passage 240 is provided between the water inlet main pipe 110 and the first cooling flow channel 210. The first cooling flow channel 210 is connected to the water inlet main pipe 110 through the water inlet passage 240.

[0060] When the cylinder assembly includes multiple cylinders, cooling water first originates from the water inlet manifold 110 and then flows into multiple water inlet passages 240. These water inlet passages 240 distribute the cooling water to the first cooling channels 210 outside each cylinder liner 200. In this way, the cooling water can fully exchange heat with the outer wall of the cylinder liner 200 in the first cooling channels 210, effectively reducing the temperature of the cylinders.

[0061] Furthermore, the axial direction of the water outlet passage 220 and the axial direction of the water inlet passage 240 are located on the same maximum outer diameter of the cylinder liner 200; the angle between the axial direction of the water outlet passage 220 and the front end face of the cylinder assembly is a second angle a2, and the angle between the axial direction of the water inlet passage 240 and the front end face of the cylinder assembly is a third angle a3: a2=a3, and 25°≤a2≤75°.

[0062] By ensuring that the axial direction of the water outlet passage 220 and the axial direction of the water inlet passage 240 are located on the same maximum outer diameter of the cylinder liner 200, it is possible to effectively ensure that the flow distance of the cooling water on both sides of the cylinder liner 200 remains consistent. This design helps to achieve uniformity in the flow of cooling water and minimizes the flow resistance of the cooling water at the intersection of the first cooling channel 210 and the water inlet and outlet channels. According to the analysis of the direction of force applied to the piston during work, the water outlet passage 220 and the water inlet passage 240 are generally required to avoid the main force-bearing area of ​​the piston, that is, the force-bearing area on the main thrust side and the auxiliary thrust side ( Figure 8 The left and right sides of the cylinder liner 200). For example, the second angle a2 (the third angle a3) can be 25°, 35°, 45°, 55°, 65° or 75°, etc.

[0063] Furthermore, the engine assembly includes a water outlet manifold 320 , the second cooling channel 310 is connected to the water outlet manifold 320 , and the water outlet manifold 320 is used to communicate with the thermostat.

[0064] When designing the cylinder assembly, the position of the water outlet manifold 320 can be flexibly set according to specific needs. Specifically, the water outlet manifold 320 can be placed inside the cylinder head 300, or it can be placed outside the cylinder head 300. When the cylinder assembly contains multiple cylinders, multiple cylinder liners 200 can share one cylinder head 300, or each cylinder liners 200 can be connected to an independent cylinder head 300. When multiple cylinder liners 200 share one cylinder head 300, the water outlet manifold 320 can be set inside the cylinder head 300, which can simplify the structure and reduce the complexity of the external pipeline. On the contrary, when each cylinder liners 200 is connected to an independent cylinder head 300, the water outlet manifold 320 can be set outside the cylinder head 300, which can ensure the sealing of the water outlet manifold 320 and make the maintenance and inspection of the cooling system more convenient.

[0065] During cooling system operation, cooling water flows from the water outlet manifold 320 and first flows to the thermostat. The thermostat regulates the flow of cooling water according to its temperature. Depending on the thermostat's regulation, some cooling water flows to the radiator for heat dissipation. In the radiator, the heat in the cooling water is dissipated through contact between the radiator's outer wall and the air. After cooling in the radiator, the cooling water's temperature decreases and then returns to the water pump through the radiator's outlet pipe. This circulation process allows the cooling water to continuously circulate within the engine assembly, effectively reducing the temperature of the cylinder components and ensuring optimal operation.

[0066] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. An engine assembly, characterized in that: The invention comprises a cylinder assembly and a water pump, wherein the cylinder assembly comprises a body (100), a cylinder liner (200) and a cylinder head (300); a mounting cavity is provided inside the body (100); the cylinder liner (200) is provided inside the mounting cavity; a first cooling channel (210) is formed between the outer wall of the cylinder liner (200) and the cavity wall of the mounting cavity; the first cooling channel (210) is connected to a water outlet passage (220); the water outlet passage (220) has a water diversion port (221) and a water outlet (222); the water diversion port (221) is connected to the water pump; a second cooling channel (310) is provided inside the cylinder head (300); the water outlet (222) is connected to the second cooling channel (310); and the second cooling channel (310) is connected to the water pump; A reinforcement portion (120) is provided on the outer side of the water outlet passage (220); A first supporting shoulder (250) is provided at the top of the cylinder sleeve (200), and a second supporting shoulder (121) is provided at the top of the water outlet passage (220). The first supporting shoulder (250) and the second supporting shoulder (121) are in contact with each other, and a height H from the second supporting shoulder (121) to the bottom of the reinforcement portion (120) is greater than the sum of a height X from the second supporting shoulder (121) to the top of the water outlet passage (220) and a height Y of the water outlet passage (220).

2. The engine assembly according to claim 1, characterized in that: The engine assembly further comprises an engine accessory, the water diversion port (221) is in communication with the engine accessory, and the engine accessory is in communication with the water pump.

3. The engine assembly according to claim 1, characterized in that: A plurality of cylinder sleeves (200) are provided in the machine body (100), the outer wall of each cylinder sleeve (200) and the cavity wall of the installation cavity respectively form the first cooling channel (210), each first cooling channel (210) is respectively connected to a water outlet passage (220), a plurality of the water outlet passages (220) all have the water outlet (222), and at least one of the water outlet passages (220) has the water diversion port (221).

4. The engine assembly according to claim 3, characterized in that: Adjacent first cooling channels (210) are connected via a connecting channel (230).

5. The engine assembly according to claim 4, characterized in that: The communication channel (230) is located between two adjacent cylinder sleeves (200), the flow direction of cooling water in the communication channel (230) is inclined toward the water outlet passage (220), and the angle between the axial direction of the communication channel (230) and the front end surface of the cylinder assembly is a first angle a1: 30°≤a1＜90°。 6. The engine assembly according to claim 1, characterized in that: A water inlet main pipe (110) is provided inside the machine body (100), a water inlet passage (240) is provided between the water inlet main pipe (110) and the first cooling flow channel (210), and the first cooling flow channel (210) is communicated with the water inlet main pipe (110) through the water inlet passage (240).

7. The engine assembly according to claim 6, characterized in that: The axial direction of the water outlet passage (220) and the axial direction of the water inlet passage (240) are located on the same maximum outer diameter of the cylinder sleeve (200); The angle between the axial direction of the water outlet passage (220) and the front end face of the cylinder assembly is a second angle a2, and the angle between the axial direction of the water inlet passage (240) and the front end face of the cylinder assembly is a third angle a3: a2=a3, and 25°≤a2≤75°.

8. The engine assembly according to any one of claims 1 to 7, characterized in that: The engine assembly comprises a water outlet main pipe (320), the second cooling channel (310) is connected to the water outlet main pipe (320), and the water outlet main pipe (320) is used to communicate with a thermostat.

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